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Updated: May 14, 2026

Adaptation of Semiautomated Circulating Tumor Cell (CTC) Assays for Clinical and Preclinical Research Applications
Published on: February 28, 2014
Circulating breast tumor cells exhibit dynamic changes in epithelial and mesenchymal composition.
Min Yu1, Aditya Bardia, Ben S Wittner
1Massachusetts General Hospital Cancer Center, Harvard Medical School, Charlestown, MA 02129, USA.
Epithelial-mesenchymal transition (EMT) drives tumor metastasis. In breast cancer patients, mesenchymal circulating tumor cells (CTCs) were enriched and linked to disease progression, suggesting EMT
Area of Science:
- Oncology
- Cell Biology
- Cancer Metastasis
Background:
- Epithelial-mesenchymal transition (EMT) is a cellular process linked to tumor metastasis in preclinical models.
- The role of EMT in human cancer progression, particularly in circulating tumor cells (CTCs), requires further investigation.
Purpose of the Study:
- To characterize EMT in CTCs from breast cancer patients.
- To investigate the association between mesenchymal CTCs and disease progression.
Main Methods:
- Characterization of EMT markers in CTCs from breast cancer patients.
- Serial monitoring of CTCs in patients undergoing therapy.
- Analysis of EMT regulators in mesenchymal CTCs.
Main Results:
- Mesenchymal cells were highly enriched in CTCs compared to primary tumors.
- Serial CTC monitoring indicated an association between mesenchymal CTCs and disease progression.
- Reversible EMT shifts were observed in an index patient correlating with therapy response and progression.
- Mesenchymal CTCs were found as single cells and clusters, expressing EMT regulators like TGF-β pathway components and FOXC1.
Conclusions:
- EMT plays a role in the blood-borne dissemination of human breast cancer.
- Mesenchymal CTCs may serve as a biomarker for disease progression and therapeutic response.
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